Check idle current on PA 7 Nakamichi

Laurent Lafran · 5th July 2008, 03:09 PM

Hello to every sound lovers,
i'm a new happy owner of a Nakamichi PA7. I heard that sometime idle current are increasing and can make damage. So, before bringing my amplifier to a technical station i thought that i could have an idea by measuring the amplifier consuption on the main cable.
Do you think it's a good idea and what could be the consuption of the pa7 WITH 0volt on the input ?
Thanks,
Laurent.

analog_sa · 5th July 2008, 03:40 PM

Quote:

Originally posted by Laurent Lafran
Do you think it's a good idea

Not very good. One channel may be up, while the other is down and the total consumption is still normal. Just open it and measure the voltage drops on the emitter resistors. If it's similar to the Threshold amps you would expect around 100mA per transistor or maybe someone can provide accurate values.

Here is the relevant thread

Nelson Pass · 5th July 2008, 10:35 PM

Put your hands on the heat sinks. If you can hold them there for
10 seconds or so, then it's just right.

MadMutt · 7th July 2008, 09:19 AM

To suit PA7 and PA7e.
From service manual.
Enjoy

PS, this 100k/1000pixels limit is really starting to wee wee me off big time..........

jiky657 · 19th January 2009, 07:03 PM

@MadMutt
Would it be possible to get a copy of the PA7e service manual?
My emailaddress is me@stairweb.de
Thanks a lot!
Regards
Markus

Laurent Lafran · 19th January 2009, 10:23 PM

Thanks to everybody.
My PA7 is now working with Rega Planar 3/RB 300 + DL103, Préamp Naka CA5E, Ditton 66 monitor rewired and Terminator 2 cable for loudspeakers.
Any advice ?
Best regards to all,
Laurent.

5th July 2008, 03:09 PM	#1
Laurent Lafran diyAudio Member Join Date: Jul 2008	Check idle current on PA 7 Nakamichi Hello to every sound lovers, i'm a new happy owner of a Nakamichi PA7. I heard that sometime idle current are increasing and can make damage. So, before bringing my amplifier to a technical station i thought that i could have an idea by measuring the amplifier consuption on the main cable. Do you think it's a good idea and what could be the consuption of the pa7 WITH 0volt on the input ? Thanks, Laurent.

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5th July 2008, 10:35 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	Put your hands on the heat sinks. If you can hold them there for 10 seconds or so, then it's just right.

19th January 2009, 07:03 PM	#5
jiky657 diyAudio Member Join Date: Jul 2004 Location: Germany	@MadMutt Would it be possible to get a copy of the PA7e service manual? My emailaddress is me@stairweb.de Thanks a lot! Regards Markus

19th January 2009, 10:23 PM	#6
Laurent Lafran diyAudio Member Join Date: Jul 2008	Thanks to everybody. My PA7 is now working with Rega Planar 3/RB 300 + DL103, Préamp Naka CA5E, Ditton 66 monitor rewired and Terminator 2 cable for loudspeakers. Any advice ? Best regards to all, Laurent.

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